Higgins (1979) proposes a taxonomy that distinguishes four kinds of copular clauses: predicational, specificational, identificational, and equative. Subsequent work has aimed to provide a theoretical understanding of Higgins' taxonomy and of the rich set of facts underpinning it, though various aspects of both have resisted explanation. In this talk I examine the taxonomy with special attention to specificational clauses and argue that they can be unified with Higgins' class of identificational clauses. This leaves us with a simpler taxonomy and a better understanding of the specificational clause type and its distinctive properties.